High serotonin levels can lead to irritability and aggression.

“person who is Brazil they're very irritable they may even become aggressive right that's not by by accident there's their serotonin is high uh and maybe because of disease as well but the serotonin levels are high and serotonin inhibits the ATP levels in the brain an animal study demonstrated a drop of ATP levels in the brain of just 20 percent Lee to Violent aggression right so these people are almost like they're not in their right mind they're almost uh temporarily insane I think it's like the legal term which they use”